Merge remote-tracking branch 'origin/master'

# Conflicts:
#	03-UnrealEngine/Sequence/Sequence Runtime Binding.md

03-UnrealEngine/Sequence/Sequence Runtime Binding.md

@@ -6,6 +6,9 @@ tags:
 rating: ⭐
 ---
 # 前言
+***MovieSceneTextTrack*** 引擎插件可以作为参考。
+***UMovieSceneCVarTrackInstance***
+
 参考：
 1. [sequencer mute tracks at runtime from c](https://forums.unrealengine.com/t/sequencer-mute-tracks-at-runtime-from-c/476278/3)
 
@@ -60,6 +63,9 @@ UMovieSceneSequenceExtensions methods are not exported. They don’t have the PL
 - LevelSequence分析
 	- https://zhuanlan.zhihu.com/p/157892605
 
+## UMovieSceneTrackInstance
+大部分Track的instance类。
+
 ## 继承关系
 UMovieSceneSignedObject -> UObject。一个UMovieScene由若干个MasterTrack(UMovieSceneTrack)组成，UMovieScene相当于是UMovieSceneTracks的容器，那么UMovieSceneTrack又由UMovieSceneSections组成，UMovieSceneSection就是一个Track中间的某一段。
 
@@ -154,6 +160,83 @@ TArray<FGuid> FSequencerUtilities::AddActors(TSharedRef<ISequencer> Sequencer, c
 }
 ```
 
+其他参考
+```c++
+const FGuid PossessableGuid = OwnerMovieScene->AddPossessable(InName, InObject.GetClass());
+
+if (!OwnerMovieScene->FindPossessable(PossessableGuid)->BindSpawnableObject(Sequencer->GetFocusedTemplateID(), &InObject, &Sequencer.Get()))
+{
+	OwnerSequence->BindPossessableObject(PossessableGuid, InObject, BindingContext);
+}
+```
+
+```c++
+FGuid FSequencerUtilities::CreateBinding(TSharedRef<ISequencer> Sequencer, UObject& InObject, const FString& InName)
+{
+	const FScopedTransaction Transaction(LOCTEXT("CreateBinding", "Create New Binding"));
+
+	UMovieSceneSequence* OwnerSequence = Sequencer->GetFocusedMovieSceneSequence();
+	UMovieScene* OwnerMovieScene = OwnerSequence->GetMovieScene();
+
+	OwnerSequence->Modify();
+	OwnerMovieScene->Modify();
+
+	const FGuid PossessableGuid = OwnerMovieScene->AddPossessable(InName, InObject.GetClass());
+
+	// Attempt to use the parent as a context if necessary
+	UObject* ParentObject = OwnerSequence->GetParentObject(&InObject);
+	UObject* BindingContext = Sequencer->GetPlaybackContext();
+
+	AActor* ParentActorAdded = nullptr;
+	FGuid ParentGuid;
+
+	if (ParentObject)
+	{
+		// Ensure we have possessed the outer object, if necessary
+		ParentGuid = Sequencer->GetHandleToObject(ParentObject, false);
+		if (!ParentGuid.IsValid())
+		{
+			ParentGuid = Sequencer->GetHandleToObject(ParentObject);
+			ParentActorAdded = Cast<AActor>(ParentObject);
+		}
+
+		if (OwnerSequence->AreParentContextsSignificant())
+		{
+			BindingContext = ParentObject;
+		}
+
+		// Set up parent/child guids for possessables within spawnables
+		if (ParentGuid.IsValid())
+		{
+			FMovieScenePossessable* ChildPossessable = OwnerMovieScene->FindPossessable(PossessableGuid);
+			if (ensure(ChildPossessable))
+			{
+				ChildPossessable->SetParent(ParentGuid, OwnerMovieScene);
+			}
+
+			FMovieSceneSpawnable* ParentSpawnable = OwnerMovieScene->FindSpawnable(ParentGuid);
+			if (ParentSpawnable)
+			{
+				ParentSpawnable->AddChildPossessable(PossessableGuid);
+			}
+		}
+	}
+
+	if (!OwnerMovieScene->FindPossessable(PossessableGuid)->BindSpawnableObject(Sequencer->GetFocusedTemplateID(), &InObject, &Sequencer.Get()))
+	{
+		OwnerSequence->BindPossessableObject(PossessableGuid, InObject, BindingContext);
+	}
+
+	// Broadcast if a parent actor was added as a result of adding this object
+	if (ParentActorAdded && ParentGuid.IsValid())
+	{
+		Sequencer->OnActorAddedToSequencer().Broadcast(ParentActorAdded, ParentGuid);
+	}
+
+	return PossessableGuid;
+}
+```
+
 ### FAudioTrackEditor
 FAudioTrackEditor::HandleAssetAdded(UObject* Asset, const FGuid& TargetObjectGuid) => FAudioTrackEditor::AddNewSound() => UMovieSceneAudioTrack::AddNewSoundOnRow(USoundBase* Sound, FFrameNumber Time, int32 RowIndex)
 
@@ -164,7 +247,8 @@ FAudioTrackEditor::HandleAssetAdded(UObject* Asset, const FGuid& TargetObjectGui
 		- `TObjectPtr<UAnimSequenceBase> Animation`
 - FSkeletalAnimationTrackEditor
 - UMovieSceneSkeletalAnimationSystem
-- ~~FSkeletalAnimationTrackEditMode~~
+	- 里面有介绍System相关的逻辑 https://zhuanlan.zhihu.com/p/413151867
+- FSkeletalAnimationTrackEditMode
 
 Track的编辑器注册位于MovieSceneToolsModule.cpp：
 ```c++
@@ -337,6 +421,41 @@ void UMovieSceneSequencePlayer::UpdateMovieSceneInstance(FMovieSceneEvaluationRa
 }
 ```
 
+这段解析来自于：https://zhuanlan.zhihu.com/p/413151867
+```c++
+UMovieSceneSequencePlayer::Play()           //蓝图中调用
+UMovieSceneSequencePlayer::PlayInternal()
+UMovieSceneSequencePlayer::UpdateMovieSceneInstance
+RootTemplateInstance.Evaluate(Context, *this);
+
+// FMovieSceneRootEvaluationTemplateInstance::Evaluate
+EntitySystemRunner.Update(Context, RootInstanceHandle);
+
+FMovieSceneEntitySystemRunner::Flush()
+FMovieSceneEntitySystemRunner::DoFlushUpdateQueueOnce()
+FMovieSceneEntitySystemRunner::GameThread_ProcessQueue()
+FMovieSceneEntitySystemRunner::GameThread_SpawnPhase()
+
+// FMovieSceneEntitySystemRunner::GameThread_SpawnPhase()
+/// System Linker->GetInstanceRegistry();
+FInstanceRegistry* InstanceRegistry = GetInstanceRegistry(); 
+FSequenceInstance& Instance = InstanceRegistry->MutateInstance(Update.InstanceHandle);
+Instance.Update(Linker, Update.Context);
+
+// FSequenceInstance::Update
+SequenceUpdater->Update(Linker, Params, ComponentField, EntitiesScratch);
+
+// FSequenceUpdater_Flat::Update
+FSequenceInstance& SequenceInstance = Linker->GetInstanceRegistry()->MutateInstance(InstanceHandle);
+SequenceInstance.Ledger.UpdateEntities
+
+// FEntityLedger::UpdateEntities
+FInstanceRegistry* InstanceRegistry = Linker->GetInstanceRegistry();
+ImportEntity(Linker, ImportParams, EntityField, Query);
+}
+```
+
+
 暂停的核心逻辑：
 ```c++
 FMovieSceneEvaluationRange CurrentTimeRange = PlayPosition.GetCurrentPositionAsRange();